Otto Löffler (* March 17, 1871 in Unteriflingen in the Black Forest; † March 12, 1949 in Plochingen) was a German composer, choirmaster, conductor and music publisher.

He published his first composition at the age of 18 and soon after took up his first position as choirmaster. The song "Der Frühling zieht ein" (Opus 17) was awarded first prize at the Swabian Singers' Festival in Ravensburg in 1904 and established him as a composer of German folk songs. Löffler was a self-taught composer but he also continued his education with courses at the Stuttgart Music Academy. In the course of time he created solo, duet and choral songs ranging from simple folk songs to difficult art songs, a cappella and with instruments. Due to his pedagogical work, children's songs were also part of his repertoire which he published in the collection "Kinderland". In his catalogue of works there are about 500 compositions including printed choral pieces as well as handwritten creations. The majority of his musical works were published by his own publishing house. In addition to his work as a composer, he was also active as a choir master in many associations in Stuttgart, Eßlingen am Neckar and the surrounding area. He was also an outstanding judge and reviewer at singing festivals. In 1937 Löffler moved with his family from Stuttgart to Plochingen where he lived until his death. With his folk songs, Löffler followed the example of the Swabian composer Friedrich Silcher.